join vs rabbet

join and rabbet both are nouns.

Word	Noun	Adjective	Verb	Adverb
join	Yes	No	Yes	No
rabbet	Yes	No	Yes	No

As verbs, rabbet is a hyponym of join; that is, rabbet is a word with a more specific, narrower meaning than join:

join (noun)	rabbet (noun)
a set containing all and only the members of two or more given sets	a rectangular groove made to hold two pieces together
the shape or manner in which things come together and a connection is made

join (verb)	rabbet (verb)
make contact or come together	cut a rectangular groove into
cause to become joined or linked	join with a rabbet joint
become part of; become a member of a group or organization
come into the company of
be or become joined or united or linked