i'm talking about words that end with an accent (b) such as:

nogot'
kogot'
mysh'
spravedlivost'

am i right when i'm saying words that end with "ost'" are all feminine?
for other words that end with a ' (b), i really have no idea. i'm always opting for masculine (since before the accent stand a consonants) but i'm know i'm wrong (mouse is an example of that).