Counterforces rhymes with:
concourses, racehorses, workhorses, airforces, bourse's, bourses, concourses, course's, discourses, divorces, endorses, enforces, force's, forces, forces', horses', outsources, pierce's, racehorses, reinforces, resources, resources', source's, workhorses
Counterforces sounds like:
canterbury's, controversies, controversy, counterforce, counteroffers