gigabit vs Gbit

gigabit and Gbit both are nouns.

Word	Noun	Adjective	Verb	Adverb
gigabit	Yes	No	No	No
Gbit	Yes	No	No	No

As nouns, gigabit and Gbit are synonyms defined as:

gigabit and Gbit: a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits

Other synonyms of gigabit include Gb.

gigabit (noun)	Gbit (noun)
a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits	a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits