join vs engraft

join is a noun but engraft is not a noun.

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

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

join (noun)	engraft (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)	engraft (verb)
make contact or come together	fix or set securely or deeply
cause to become joined or linked	cause to grow together parts from different plants
become part of; become a member of a group or organization
come into the company of
be or become joined or united or linked