rowlock vs tholepin

rowlock and tholepin both are nouns.

Word	Noun	Adjective	Verb	Adverb
rowlock	Yes	No	No	No
tholepin	Yes	No	No	No

As nouns, rowlock and tholepin are synonyms defined as:

rowlock and tholepin: a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing

Other synonyms of rowlock include oarlock, peg, pin, thole.

rowlock (noun)	tholepin (noun)
a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing	a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing