Extendible rhymes with:
anibal, berkebile, bonnibel, bonnibelle, contibel, corruptible, dulcibelle, fungible, hannibal, imperceptible, impermissible, incomprehensible, incontrovertible, indelible, indestructible, indispensible, indivisible, interruptible, irascible, nondeductible, submersible, unadjustable, uncollectible