The two words are quite different and I do not see how they can ever be synonyms.

PRECISE

# sharply exact or accurate or delimited; "a precise mind"; "specified a precise amount"; "arrived at the precise moment"
# accurate: (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth ; strictly correct; "a precise image"; "a precise measurement"
wordnetweb.princeton.edu/perl/webwn


# exact, accurate; Of experimental results, consistent, clustered close together, agreeing with each other. This does not mean that they cluster near the true, correct, or accurate value
en.wiktionary.org/wiki/precise


# precisely - indicating exactness or preciseness; "he was doing precisely (or exactly) what she had told him to do"; "it was just as he said--the jewel was gone"; "it has just enough salt"
# precisely - in a precise manner; "she always expressed herself precisely"
# precisely - just as it should be; "`Precisely, my lord,' he said"
wordnetweb.princeton.edu/perl/webwn


# precision - preciseness: the quality of being reproducible in amount or performance; "he handled it with the preciseness of an automaton"; "note the meticulous precision of his measurements"
wordnetweb.princeton.edu/perl/webwn


# preciseness - clarity as a consequence of precision
wordnetweb.princeton.edu/perl/webwn


# Precision - In statistics, the term precision can mean a quantity defined in a specific way. This is in addition to its more general meaning in the context of accuracy and precision. "Precision" is used for in relation to a single quantity, while precision matrix or concentration matrix,Dodge Y. ...
en.wikipedia.org/wiki/Precision_(statistics)


# Precision - In computer science, precision of a numerical quantity is a measure of the detail in which the quantity is expressed. This is usually measured in bits, but sometimes in decimal digits. It is related to precision in mathematics, which describes the number of digits that are used to express a value.
en.wikipedia.org/wiki/Precision_(computer_science)


# The precision of a value describes the number of digits that are used to express that value. In a scientific setting this would be the total number of digits (sometimes called the significant figures or significant digits) or, less commonly, the number of fractional digits or decimal places (the ...
en.wikipedia.org/wiki/Precision_(arithmetic)


# Precision and recall are two widely used statistical classifications.
en.wikipedia.org/wiki/Precision_(information_retrieval)


# Precision is the authorized march of Royal Military College of Canada. It was composed in 1932 by Denise Chabot, wife of Major C. A. Chabot, a Royal Canadian Artillery officer on staff as professor of French at the College at the time. ...
en.wikipedia.org/wiki/Precision_(march)


# precision - the state of being precise or exact; exactness; the ability of a measurement to be reproduced consistently; the number of significant digits to which a value may be measured reliably; used for exact or precise measurement; made, or characterized by accuracy
en.wiktionary.org/wiki/precision


# A precise measurement is one that has small scatter about the average value. See also accurate.
neyersoftware.com/Glossary.htm

RELIABLE

* worthy of reliance or trust; "a reliable source of information"; "a dependable worker"
* authentic: conforming to fact and therefore worthy of belief; "an authentic account by an eyewitness"; "reliable information"
wordnetweb.princeton.edu/perl/webwn


* Something or someone reliable; Suitable or fit to be relied on; worthy of dependence or reliance; trustworthy; Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't
en.wiktionary.org/wiki/reliable


* reliably - faithfully: in a faithful manner; "it always came on, faithfully, like the radio"
wordnetweb.princeton.edu/perl/webwn


* reliability - dependability: the quality of being dependable or reliable
wordnetweb.princeton.edu/perl/webwn


* Reliability - In computer networking, a reliable protocol is one that provides reliability properties with respect to the delivery of data to the intended recipient(s), as opposed to an unreliable protocol, which does not provide notifications to the sender as to the delivery of transmitted data.
en.wikipedia.org/wiki/Reliability_(computer_networking)


* In statistics, reliability is the consistency of a set of measurements or measuring instrument, often used to describe a test. Reliability is inversely related to random error.
en.wikipedia.org/wiki/Reliability_(statistics)


* Reliability of semiconductor devices can be summarized as follows: # Semiconductor devices are very sensitive to impurities and particles. Therefore, to manufacture these devices it is necessary to manage many processes while accurately controlling the level of impurities and particles. ...
en.wikipedia.org/wiki/Reliability_(semiconductor)


* Reliability engineering is an engineering field, that deals with the study of : the ability of a system or component to perform its required functions under stated conditions for a specified period of time. It is often reported as a probability.
en.wikipedia.org/wiki/Reliability_(engineering)


* reliably - In a reliable manner
en.wiktionary.org/wiki/reliably


* A reliable language test or other assessment tool produces the same results in the same group if the test is repeated, regardless of who is marking the test. A test can never be perfectly reliable but good tests strive for high reliability.
www.linguanet-europa.org/plus/en/glossary.jsp


* high degree of certainty and predictability for a desired outcome; an EREA effectiveness-assessment theme associated with the physical dimension of a context
www.tetradian.com/Glossary


* Now consider a message passing service with stronger guarantees. A synchronous service sends messages reliably in order. The client side 'call' function blocks until a response is received and it returns the response to another client-supplied buffer.
www.embedded.com/showArticle.jhtml


* Research is reliable if it can be trusted and you can depend on it.
www.barrycomp.com/bhs/guide/key_terms.html


* Giving the same result on successive trials.
www.ped.state.nm.us/standards/language/glossary.html