waterman vs canoeist

waterman and canoeist both are nouns.

Word	Noun	Adjective	Verb	Adverb
waterman	Yes	No	No	No
canoeist	Yes	No	No	No

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

Other hyponyms of waterman include paddler, ferryman, gondolier, gondoliere, rower, punter.

waterman (noun)	canoeist (noun)
someone who drives or rides in a boat	someone paddling a canoe