Similar words
ócio
ócio is more literary or philosophical, idleness as a concept; lazer is more everyday, leisure activities and free time.
Similar in other languages
Spanish
ocio
ocio is the Spanish word for the same thing — both mean "leisure."
Practice
1 What does lazer mean?
leisure
2 Fill the gap: Tenho pouco ___.
Full sentence: Tenho pouco lazer. (I have little leisure.)
3 Which fingerprint chart matches lazer?
lazer: neutral register, common frequency, general domain, neutral connotation.