obligate vs biological science

obligate is not a noun while biological science is a noun.

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

obligate (noun)	biological science (noun)
	the science that studies living organisms

obligate (adjective)	biological science (adjective)
restricted to a particular condition of life

obligate (verb)	biological science (verb)
bind by an obligation; cause to be indebted
commit in order to fulfill an obligation
force somebody to do something