/e/ versus /@/: 36 pairs of which 6 are -ment homographs (verb v. noun), and 11 are compounds of -men v. -man words where the contrast is no more than optional.

bowmen bowman
cattlemen cattleman 
cavalrymen cavalryman 
churchmen churchman 
coachmen coachman 
coalmen coalman 
compliment complement 
complimented complemented 
complimenting complementing 
compliments complements 
document document
documents documents
essay assay 
essayed assayed 
essaying assaying 
essays assays 
hem h'm 
hemmed h'mmed 
hemming h'mming 
hems h'ms 
implement implement
implements implements
M'em 
N'un 
ornament ornament
ornaments ornaments
pelisse police
pelisses polices
railwaymen railwayman 
servicemen serviceman 
supplement supplement
supplements supplements
villainess villainous
woodmen woodman 
woodsmen woodsman 
workmen workman