half-timber vs half-timbered

half-timber and half-timbered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
half-timber	No	Yes	No	No
half-timbered	No	Yes	No	No

As adjectives, half-timber and half-timbered are synonyms defined as:

half-timber and half-timbered: having exposed wood framing with spaces filled with masonry, as in Tudor architecture

half-timber (adjective)	half-timbered (adjective)
having exposed wood framing with spaces filled with masonry, as in Tudor architecture	having exposed wood framing with spaces filled with masonry, as in Tudor architecture