Without context, I doubt many native English speakers would know the meaning of "almonry".

From [1], they seem obsolete well before any colonization, so it's probably only British people with an interest in church history.

"Alms" is already fairly obscure, [2] puts it at word frequency 44625. Almonry is not in the top 333,333 words.

[1] https://en.wikipedia.org/wiki/Almonry

[2] http://norvig.com/ngrams/