propagate vs biological science

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

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

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

propagate (verb)	biological science (verb)
multiply sexually or asexually
cause to propagate, as by grafting or layering
cause to become widely known
transmit
transmit or cause to broaden or spread
become distributed or widespread
travel through the air
transmit from one generation to the next