Similar words
hostile
Close — "a bitter rival" means a hostile one.
Similar in other languages
German
bitter
bitter is the German word for the same thing — both mean "bitter."
Spanish
amargo
amargo is the Spanish word for the same thing — both mean "bitter."
Practice
1 What does amer mean?
bitter
2 Fill the gap: Le café noir est trop ___ pour elle.
Full sentence: Le café noir est trop amer pour elle. (Black coffee is too bitter for her.)
3 Which fingerprint chart matches amer?
amer: neutral register, core frequency, general domain, neutral connotation.