Esp. 紅い for scarlet, 朱い for vermilion

red; crimson; scarlet; vermilion

Colloquial

Red; communist

Common noun; Nouns which may take the genitive case particle 'no'

red; crimson; scarlet

Common noun

red-containing colour (e.g. brown, pink, orange)

Colloquial; Common noun; Often written as アカ

Red (i.e. communist)

Abbreviation; Common noun

red light (traffic)

Abbreviation; Common noun

red ink (i.e. in finance or proof-reading); (in) the red

Nouns which may take the genitive case particle 'no'

complete; total; perfect; obvious

赤 only; Abbreviation; Common noun

copper

Abbreviation; Common noun; Hanafuda

red 5-point card

scarlet; cardinal red

red hakama (worn by miko or noblewomen at court)

red carp; golden carp

crimson crepe (fabric)

scarlet

deep scarlet

Taiwan cherry (Prunus campanulata); winter cherry tree

red hakama (worn by miko or noblewomen at court)