As a noun terms
is .
As an adjective gassiest is
(gassy).
terms
English
Noun
(head)
Statistics
*
----
gassiest
English
Adjective
(head)
(gassy)
gassy
English
Adjective
(er)
Of a beverage, containing dissolved gas (usually carbon dioxide).
Flatulent.
Synonyms
* (of a beverage, containing gas ): fizzy