pom_poms has various valid spellings that I think should be aliased.
Another thing to consider is aliasing the singular forms of these spellings.
See http://en.wikipedia.org/wiki/Pom-pon#Spelling
pompom
pompoms (already aliased)
pom-pom
pom-poms
pompon
pompons
pom-pon
pom-pons
Updated by jxh2154