gased / gassed / gast are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
gased: (verb) attack with gas; subject to gas fumes.
gassed: (verb) attack with gas; subject to gas fumes.
gast: NA
gased: NA
gassed: g·AE·s·t
gast: g·AE·s·t
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)