tholepin vs rowlock

tholepin and rowlock both are nouns.

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

As nouns, tholepin and rowlock are synonyms defined as:

tholepin and rowlock: 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 tholepin include oarlock, peg, pin, thole.

tholepin (noun)	rowlock (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