small boat vs coracle

small boat and coracle both are nouns.

Word	Noun	Adjective	Verb	Adverb
small boat	Yes	No	No	No
coracle	Yes	No	No	No

As nouns, coracle is a hyponym of small boat; that is, coracle is a word with a more specific, narrower meaning than small boat:

small boat: a boat that is small
coracle: a small rounded boat made of hides stretched over a wicker frame; still used in some parts of Great Britain

Other hyponyms of small boat include canoe, cockleshell, dinghy, dory, rowboat, gig, racing boat, skiff, yawl.

small boat (noun)	coracle (noun)
a boat that is small	a small rounded boat made of hides stretched over a wicker frame; still used in some parts of Great Britain