Numismatics rhymes with:
automatics, charismatics, dramatics, informatics, klezmatics, mathematics, pneumatics, systematics, telematics, acrobatics, aerobatics, attics, automatics, batiks, charismatics, democratic's, democratics, dramatics, fanatics, informatics, klezmatics, mathematics, pneumatics, systematics, telematics
Numismatics sounds like:
nanoseconds, neighmond's, numismatic