hùn​wéi​yī​tán

conflate

混为一谈 (混為一談) hùn​wéi​yī​tán
conflate idiom
to confuse one thing with another; to muddle

You cannot lump these two completely different things together.

Frequency

Movie subtitles
1.43 per million appears in 1% of films
Written text
1.05 per million

Sources

Definitions
CC-CEDICT