valence vs biological science

valence and biological science both are nouns.

Word	Noun	Adjective	Verb	Adverb
valence	Yes	No	No	No
biological science	Yes	No	No	No

valence (noun)	biological science (noun)
(chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)	the science that studies living organisms
(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate