Lengthways rhymes with:
pathways, airway's, airways, airways', alleyways, always, anyways, aways, broadway's, brockway's, byways, callaway's, cashways, castaways, causeways, doorways, driveways, edgeways, elway's, fairways, folkways, foodways, freeways, freightways, galloways, gateway's, gateways, getaways, giveaways, hallways, hathaway's, hemingway's, highway's, highways, leaseway's, midway's, norway's, outweighs, pathways, railway's, railways, roadways, runaways, runways, safeway's, sideways, stairways, steinway's, strangwayes, subways, superhighways, trailways, trailways', uruguay's, usairways, walkways, waterways
Lengthways sounds like:
lamastus, lancet's, lancets, lengths, lengthwise, linguistic, linguistics, linguists, longitudes