- 赤ちゃん【あかちゃん】 - baby, infant 
- 赤い【あかい】 - red, crimson, scarlet, vermilion, Red, communist 
- 赤ん坊【あかんぼう】 - baby, infant 
- 赤木【あかぎ】 - bishop wood (Bischofia javanica), barked tree, red tree 
- 真っ赤【まっか】 - bright red, deep red, flushed (of face), downright (e.g. lie), complete, utter 
- 赤血球【せっけっきゅう】 - red blood cell, erythrocyte 
- 赤字【あかじ】 - (being in) the red, deficit, red letter, red writing, corrections (by a teacher or proofreader) written in red 
- 赤道【せきどう】 - equator 
- 赤色【あかいろ】 - red, red color (colour), communism, the left 
- 赤飯【せきはん】 - red rice (beans and mochi) for auspicious occasions 
- 赤毛【あかげ】 - red hair, ginger hair 
- 赤松【あかまつ】 - Japanese red pine (Pinus densiflora), Japanese umbrella pine, tanyosho pine 
- 赤痢【せきり】 - dysentery 
- 赤軍【せきぐん】 - Red Army (Soviet Union, 1918-1946), Workers' and Peasants' Red Army, Japanese Red Army, JRA 
- 赤外線【せきがいせん】 - infrared rays, infrared radiation 
- 赤信号【あかしんごう】 - red light (traffic), red light, signal to stop, sign of danger 
- 赤旗【あかはた】 - red flag, Red Flag (Communist Party newspaper) 
- 赤土【あかつち】 - red clay, red earth, laterite, dark-red paint 
- 赤茶ける【あかちゃける】 - to turn reddish-brown, to turn rufous, to become discolored, to become discoloured 
- 赤身【あかみ】 - red flesh (of a fish), red-fleshed fish (e.g. tuna), lean meat, heartwood