RichThesaurus
felt-tip pen
vs
felt-tipped pen
felt-tip pen
noun
A pen that holds quick-drying ink conveyed to a writing surface by means of a felt nib.
felt-tipped pen
noun
felt-tip pen
How often have the words
felt-tip pen
and
felt-tipped pen
occurred in a corpus of books?
(source:
Google Ngram Viewer
)