/ʊ/ vs /uː/

Short, lax /ʊ/ (full) vs long, tense /uː/ (fool).

Pro drill

Drill this contrast

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could
/kəd/
vs

cooed
drill word /kuːd/

Nucleus
fool
/fuːl/
vs

full
/fʊl/

Nucleus
good
/ɡʊd/
vs

gooed
drill word /ɡuːd/

Nucleus
hood
[hʊ̈d]
vs

who'd
drill word /huːd/

Nucleus
look
/lʊk/
vs

Luke
drill word /luːk/

Nucleus
pool
/pul/
vs

pull
/pʉl/

Nucleus
suit
/sjuːt/
vs

soot
/sʊt/

Nucleus
would
/wəd/
vs

wooed
drill word /wuːd/

Nucleus
stood
/stʊd/
vs

stewed
/stuːd/

Nucleus
nought
/nʊt/
vs

newt
/nuːt/

Nucleus