nog vs trenail

nog and trenail both are nouns.

Word	Noun	Adjective	Verb	Adverb
nog	Yes	No	No	No
trenail	Yes	No	No	No

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

nog: a wooden pin pushed or driven into a surface
trenail: a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast

Other hyponyms of nog include golf tee, tee, tent peg, treenail, trunnel.

nog (noun)	trenail (noun)
a wooden block built into a masonry wall so that joinery structure can be nailed to it	a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast
a wooden pin pushed or driven into a surface