LGBT+ vs LGBT

LGBT+ and LGBT both are nouns.

Word	Noun	Adjective	Verb	Adverb
LGBT+	Yes	No	No	No
LGBT	Yes	No	No	No

As nouns, LGBT+ and LGBT are synonyms defined as:

LGBT+ and LGBT: the community of people who have a non-normative gender and/or sexual identity, including lesbian, gay, bisexual, transgender, intersex, or asexual

Other synonyms of LGBT+ include LGBTQ, LGBTQIA+, LGBTQIA.

LGBT+ (noun)	LGBT (noun)
the community of people who have a non-normative gender and/or sexual identity, including lesbian, gay, bisexual, transgender, intersex, or asexual	the community of people who have a non-normative gender and/or sexual identity, including lesbian, gay, bisexual, transgender, intersex, or asexual