You need to do a bit of work on learning the meaning of suffixes. 

Here's a little word-building exercise:

1)  -able   = describes what it is possible to do with something

This pen is broken, so it isn't usable any more.

This water comes straight from the dirty river, so it isn't drinkable.

Something that you can use   = usable

Something that you can drink = drinkable

Something that you can eat  =    ................?

Something that you read      =     ................?

Something that you can tolerate  =    ...............?

2)  - ant   = describes what a person or thing does, or how they behave.

He doesn't have a job, so he is reliant on his parents.

A person who relies  = reliant

A person who hesitates = .....................?

A person who dominates =  ..................?

A person who tolerates =  ..................?