elan vital vs biological science

elan vital and biological science both are nouns.

Word	Noun	Adjective	Verb	Adverb
elan vital	Yes	No	No	No
biological science	Yes	No	No	No

elan vital (noun)	biological science (noun)
(biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms	the science that studies living organisms