Dyfalder, n. diligence
Dyfalgerdd, n. descriptive song
Dyfaliad, n. making a simile
Dyfalu, v. to make a simile, to liken; to guess to describe
Dyfarnu, v. to pass sentence
Dyfeirio, v. to grow furious
Dyfeisiad, n. invention
Dyfeisio, v. to devise; to guess
Dyfeithrin, v. to be nursing
Dyfelu, v. to bicker, to brawl