phylum vs biological science

phylum and biological science both are nouns.

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

phylum (noun)	biological science (noun)
(biology) the major taxonomic group of animals and plants; contains classes	the science that studies living organisms
(linguistics) a large group of languages that are historically related