guise / guys 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. 👇
guise: (noun) an artful or simulated semblance.
guys: (noun) an informal term for a youth or man. (noun) an effigy of Guy Fawkes that is burned on a bonfire on Guy Fawkes Day. (noun) a cable, wire, or rope that is used to brace something (especially a tent). (verb) steady or support with a guy wire or cable.
guise: g·AY·z
guys: g·AY·z
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)