https://en.wikipedia.org/wiki/Buffalo_buffalo_Buffalo_buffalo_buffalo_buffalo_Buffalo_buffalo

see also https://en.wikipedia.org/wiki/James_while_John_had_had_had_had_had_had_had_had_had_had_had_a_better_effect_on_the_teacher

Ignoring capitalisation you can add as many buffalos as you like and still be parsable. I’ve only ever heard buffalo used as a verb in this one context, though, so seems a bit forced to me

Gorilla gorilla, Gorilla gorilla gorilla, gorilla Gorilla gorilla