• 脂あぶら — fat; grease
• 脂肪しぼう — fat; body fat
• 油脂ゆし — oils and fats
• 樹脂じゅし — resin
• 脱脂だっし — defatting; removal of fat
• 脂身あぶらみ — fatty part of meat

脂 is 月 “flesh/body” plus the phonetic 旨 (シ). It literally shows the fatty part of the body, and by extension means fat, grease, or resin.