oar vs sweep oar

oar and sweep oar both are nouns.

Word	Noun	Adjective	Verb	Adverb
oar	Yes	No	No	No
sweep oar	Yes	No	No	No

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

Other hyponyms of oar include boat paddle, paddle, scull, scull, sweep.

oar (noun)	sweep oar (noun)
an implement used to propel or steer a boat	a long oar used in an open boat