As verbs the difference between mispays and missays
is that mispays is (mispay) while missays is (missay).
mispays
English
Verb
(head)
(mispay) mispay
English
Verb
To pay incorrectly, or to the wrong person.
(obsolete) To dissatisfy.
missays
English
Verb
(head)
(missay) missay
English
Verb
(archaic) To speak ill of (someone).
(obsolete) To say something erroneous; to speak wrongly.
*1590 , (Edmund Spenser), The Faerie Queene , III.2:
*:The worde gone out she backe againe would call, / As her repenting so to have missayd [...].