Nouns

(n)felta fabric made of compressed matted animal fibers

Verbs

(v)feltmat together and make felt-like“felt the wool”
(v)feltcover with felt“felt a cap”
(v)felt, felt up, mat up, matt-up, matte up, matte, matchange texture so as to become matted and felt-like“The fabric felted up after several washes”