lensman vs cameraman

lensman and cameraman both are nouns.

Word	Noun	Adjective	Verb	Adverb
lensman	Yes	No	No	No
cameraman	Yes	No	No	No

As nouns, cameraman is a hyponym of lensman; that is, cameraman is a word with a more specific, narrower meaning than lensman:

Other hyponyms of lensman include camera operator, cinematographer, paparazzo, press photographer.

lensman (noun)	cameraman (noun)
someone who takes photographs professionally	a photographer who operates a movie camera