dù

dù
noun
  1. (Southern Vietnam) umbrella
  2. parachute

conj
  1. (literary or formal) even if, although

dầu

dầu
noun
  1. oil
  2. Dipterocarpus

dẫu

dẫu
conj
  1. (literary) although; despite; in spite of

ru

ru
verb
  1. to sing (a baby) to sleep

particle
  1. (literary, dated) final particle used for negation or to form rhetorical questions

油

油
character
  1. chữ Hán form of du (“oil”).
  2. Nôm form of dầu (“oil”).