Herewith, more top-of-the-page juxtapositions lifted from Webster’s College Dictionary, c. 1991.

heresy to hero sandwich
hostage to hot tub
hot war to housekeeper
illuminati to imbecile
impregnable to impulse
jelly to jet engine

jihad to jockey
jumping bean to junkie
Kaposi’s sarcoma to katzenjammer*
kidney bean to kimono
kudos to kvetch
Labrador retriever to lactation
lay to L.D.S.
lonely to long-lasting
loon to Lord Chancellor
medieval to megahertz

*noun; 1. the unpleasant afteraffects of excessive drinking; hangover. 2. uneasiness; anguish; distress. 3. an uproar; clamor.