bus / buss 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. 👇
bus: (noun) a vehicle carrying many passengers; used for public transport. (noun) a car that is old and unreliable. (verb) send or move around by bus. (verb) ride in a bus. (verb) remove used dishes from the table in restaurants.
buss: NA
bus: b·AH·s
buss: b·AH·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)