join vs interlink

join is a noun but interlink is not a noun.

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

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

Other hyponyms of join include syndicate, articulate, complect, interconnect.

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

join (verb)	interlink (verb)
make contact or come together	cause to be interconnected or interwoven
cause to become joined or linked	be interwoven or interconnected
become part of; become a member of a group or organization
come into the company of
be or become joined or united or linked