what is the difference between outcast and isolated?

[Umbrella]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #84 "Improving Verbal Skills", question 5

He had to be ......... from all the other patients in the hospital because he had a highly contagious disease.

(a) outcast
(b) eliminated
(c) extracted
(d) isolated

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #84 "Improving Verbal Skills", answer 5

He had to be isolated from all the other patients in the hospital because he had a highly contagious disease.

Correct answer: (d) isolated
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what is the difference between outcast and isolated?

Umbrella

[Mister Micawber]

.
Outcast = socially isolated
.
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Native English teacher at Mister Micawber's