Diehard rhymes with:
barnhard, blowhard, eckhard, ekkehard, engelhard, gerhard, lienhard, newhard, reinhard, appleyard, backyard, bankcard, barnhard, barnyard, beauregard, blowhard, blvd, boatyard, bodyguard, boulevard, brickyard, churchyard, courtyard, damgard, datacard, dockyard, eckhard, ekkehard, engelhard, farmyard, flashcard, fugard, gelbard, gerhard, ginyard, graveyard, grossbard, hildegard, hildegarde, hillyard, julliard, junkyard, leotard, lienhard, lifeguard, lumberyard, mastercard, melgaard, moneycard, newhard, overgaard, postcard, reinhard, rutgard, safecard, safeguard, schoolyard, scorecard, scotchgard, shipyard, shurgard, sinyard, smartcard, stockyard, studtgard, sungard, telecard, vanguard, waldegard, westergaard, wildcard, willyard, woodyard
Diehard sounds like:
dared, darity, dart, darted, darth, dartt, darty, dearth, dehart, dehydrate, dehydrated, derida, deride, derided, derward, deteriorate, deteriorated, deterred, detert, detoured, detroit, dewaard, dewart, deweerd, diorite, dirt, dirty, doherty, dorado, dorette, doretti, dority, dorotea, dorothea, dorothy, dort, dorta, dorthea, dorthy, dorward, dorwart, drawdy, dread, dreaded, dred, dredd, drewett, dried, droddy, druid, duarte, duhart, durette, durrett, durward