bottom dog vs subordinate

bottom dog and subordinate both are nouns.

Word	Noun	Adjective	Verb	Adverb
bottom dog	Yes	No	No	No
subordinate	Yes	Yes	Yes	No

As nouns, subordinate is a hypernym of bottom dog; that is, subordinate is a word with a broader meaning than bottom dog:

Other hypernyms of bottom dog include foot soldier, subsidiary, underling.

bottom dog (noun)	subordinate (noun)
a person of low status	a word that is more specific than a given word
	an assistant subject to the authority or control of another

bottom dog (adjective)	subordinate (adjective)
	lower in rank or importance
	subject or submissive to authority or the control of another
	(of a clause) unable to stand alone syntactically as a complete sentence

bottom dog (verb)	subordinate (verb)
	make subordinate, dependent, or subservient
	rank or order as less important or consider of less value