usable

As adjectives the difference between usable and effective

is that usable is capable of being used while effective is having the power to produce a required effect or effects.

As a noun effective is

(military) a soldier fit for duty.

As adjectives the difference between usable and suitable

is that usable is capable of being used while suitable is having sufficient or the required properties for a certain purpose or task; appropriate to a certain occasion.

As adjectives the difference between valid and usable

is that valid is well grounded or justifiable, pertinent while usable is capable of being used.

As a verb validate

is to render valid.

As an adjective usable is

capable of being used.

As adjectives the difference between usable and sellable

is that usable is capable of being used while sellable is able or likely to be sold.

As adjectives the difference between feasible and usable

is that feasible is that can be done in practice while usable is capable of being used.

As adjectives the difference between usable and usefull

is that usable is capable of being used while usefull is .

As adjectives the difference between usable and useless

is that usable is capable of being used while useless is without use or possibility to be used.

As adjectives the difference between modular and usable

is that modular is consisting of separate modules; especially where each module performs or fulfills some specified function and could be replaced by a similar module for the same function, independently of the other modules while usable is capable of being used.