As an adjective mouthlike
is resembling a mouth or some aspect of one.
As a noun mouthline is
the line formed by a creature's closed mouth.
mouthline
English
Noun
(
en noun)
The line formed by a creature's closed mouth.
* 1986 , Robert T. Bakker, The dinosaur heresies
- Traditionally, duckbill dinosaurs have been portrayed as cheekless, with the mouthline running from chin to ear