The word you are looking for is chara.
It's five letters, ending in A.
Chara is an algae which forms in freshwater lakes in limestone-heavy environments.
titled
loon
evolve
It could be a 'port'...
again
Talc
omitted
poll
hord
Talk
nudist
Carp?That's what I thought, but I Googled carp and found out that they are a freshwater fish.The Scup is an Atlantic Fish spelt with 4 letters and ending with a p.