t1=d1=bo1=bl2 is a wakeboard of material/property t2.
From tanbo, djacu, boxna, bloti (bo2-bo5,bl2, bl3 subsumed). See also sufingboard (=bonjacta'o), windsurfingboard (=fanjacta'o), kitesurfingboard (=volfanjacta'o), wakesurfingboard (=blobonjacta'o).