ranker vs soldier

ranker and soldier both are nouns.

Word	Noun	Adjective	Verb	Adverb
ranker	Yes	No	No	No
soldier	Yes	No	Yes	No

As nouns, soldier is a hypernym of ranker; that is, soldier is a word with a broader meaning than ranker:

ranker (noun)	soldier (noun)
an enlisted soldier who serves in the ranks of the armed forces	a wingless sterile ant or termite having a large head and powerful jaws adapted for defending the colony
a commissioned officer who has been promoted from enlisted status	an enlisted man or woman who serves in an army

ranker (verb)	soldier (verb)
	serve as a soldier in the military