join vs joining

join and joining both are nouns.

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

join (noun)	joining (noun)
a set containing all and only the members of two or more given sets	the act of bringing two things into contact (especially for communication)
the shape or manner in which things come together and a connection is made

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