Synonyms for Suffer:

n.

bother, trouble, droop, stifle, pound, flag, sicken, grieve, recover. acquiesce, go down with, authorize, come down with, indulge, bow, submit, connive at, invade. approve, give/get the go-ahead, empower, say yes, mandate, happy, sorrow, lament, mourn. go through, decline, taste, know, feel, degenerate, prove, slip into, descend into, participate, escalate, deepen, go down, spiral, deteriorate, worsen. suffer (noun)
get, tolerate, abide, stomach, endure, meet, brook, stand, sustain, support, hurt, ache, bear, put up.

v.

ache (verb)
throb, pound.
bear up (verb)
persevere.
body (verb)
hurt, sustain, get.
pain (verb)
distress, stitch, wrench, discomfort, crick, afflict, sore, chafe, agonize, smart, sting, torment, ache, throe, inflame, throb, irritate, anguish, rack, hurt, torture, pain, cramp.
perception (verb)
endure.

Other synonyms:

sicken, trouble, pound, go down with, mourn, come down with. invade, come under, stifle, bother. grieve, prove, lament, go through. submit. taste, know. feel. abide
put up with.
endure
go through, bear.
experience
feel.
permit
say yes.
put-up
put up.
support
support.

Usage examples for suffer

  1. I cannot suffer that kind of thing. – Charlotte's Inheritance by M. E. Braddon
  2. We let France fall and suffer – Between You and Me by Sir Harry Lauder
  3. I saw how they could suffer – The Metropolis by Upton Sinclair