linkage vs genetic science

linkage and genetic science both are nouns.

Word	Noun	Adjective	Verb	Adverb
linkage	Yes	No	No	No
genetic science	Yes	No	No	No

linkage (noun)	genetic science (noun)
the act of linking things together	the branch of biology that studies heredity and variation in organisms
a mechanical system of rods or springs or pivots that transmits power or motion
(genetics) traits that tend to be inherited together as a consequence of an association between their genes; all of the genes of a given chromosome are linked (where one goes they all go)
an associative relation