It is "moustache"
Moustache
The correct spelling is usually mustache but also the original French moustache (hair grown on the upper lip).
Moustache or mustache are correct. It is kind of like color and colour. there are multiple ways to spell it.
The French word moustache is a cognate and means mustache.
El bigote.
The correct spelling is "mustache."
In Britain, it is spelled moustache. In the US, it is spelled mustache.
The usual spelling is "mustache" but also "moustache."
Moo-stash
It is called a "barbiche" in french.
The term may be spelled mustache or moustache(facial hair typically between the nose and upper lip).
Stanley French, hands down, has the most epic mustache of all time. I heard that one time, it strangled a Kodiak Bear to death in under 2 minutes...