Alkanes rhymes with:
hurricane's, hurricanes, arellanes, bloodstains, cobain's, hurricane's, hurricanes, kardashian's, magallanes, membranes, messiaen's, migraines, monoplanes, outgains, santillanes, sarbanes, warplanes, windowpanes
Alkanes sounds like:
alaskans, alcan's, aligning, aligns, alkenes, alleghenies, allegheny's, allegiance, allegiances, alleging, allgemeines, allison's, allusions