LGBTQIA vs LGBT

LGBTQIA and LGBT both are nouns.

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

As nouns, LGBTQIA and LGBT are synonyms defined as:

LGBTQIA 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 LGBTQIA include LGBT+, LGBTQ, LGBTQIA+.

LGBTQIA (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