razor-sharp, sharp
a cat with sharp claws

curved
large, long
powerful, strong
retractable

sharpen
dig, sink
The tiger dug its claws into his leg.

bare, show
The lion growled and showed its claws.

extend, flex
retract

dig into sth
rake

mark

in sb's claws
The cat held a bird in its claws.

Claw is used with these nouns as the subject:
hand

Claw is used with these nouns as the object:
way