As adjectives the difference between compostable and composable
is that compostable is suitable for compost while composable is capable of being composed (as from multiple lesser elements).
As a noun compostable
is that which is suitable for compost.
compostable
English
Adjective
(-)
Suitable for compost.
Noun
(
en noun)
That which is suitable for compost.
composable
English
Adjective
(-)
Capable of being composed (as from multiple lesser elements).