1
Occur
Synonyms: Happen; exist
Synonyms: Dawn on; Strike
Verb
2
Odour
Synonyms: Smell; Stink
Noun
3
Omen
Synonyms: sign; signal
Noun
4
Opaque
Synonyms: Cloudy; Murky
Antonyms: Transparent; clear
Adjective
5
Oppress
Synonyms: persecute; abuse
Antonyms: Comfort; aid; support
verb
6
Optimistic
Synonyms: Confident; hopeful
Antonym: pessimistic
7
Ordeal
Synonyms: hardship; trial
Noun
8
Patience
Synonyms: Calmness; camposure
Antonym: impatience
Noun
9
Percive
Synonyms: notice; see
verb
10
Perilous
Synonyms: Dangerous; risky
Antonym: safe
Adjective
11
Perish
Synonyms: Die; expire
Synonyms: rot; disintegrate
Verb
12
Pioneer
Synonyms: Founder; Innovator
Synonyms: Establish; invent
Noun
Verb