敵 TEKI, kataki - enemy, opponent
麦 BAKU, mugi - wheat, barley, rye, oats
抵 TEI - resist
層 SOU - layer
衆 SHUU, SHU - multitude, public, populace
All take 大 (DAI, oo(kii) - big) in front to make a word, but only 麦 uses the "Oo" reading (Oomugi); the others are all "Tai/Dai-":
大敵 TAITEKI - a strong enemy
大麦 oomugi - barley
大抵 TAITEI - normally, the norm
大層 TAISOU - huge, extreme
大衆 TAISHUU - the public, society