LGBT vs LGBTQIA

LGBT and LGBTQIA both are nouns.

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

As nouns, LGBT and LGBTQIA are synonyms defined as:

LGBT and LGBTQIA: 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 LGBT+, LGBTQ, LGBTQIA+.

LGBT (noun)	LGBTQIA (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