As verbs the difference between displumed and displumes
is that displumed is past tense of displume while displumes is third-person singular of displume.
displumed
English
Verb
(head)
(displume)
displume
English
Verb
(displum)
To deprive of feathers, plumes, awards.
References
*Chambers's Etymological Dictionary , 1896, p. 132