/A/ versus /u/: 75 pairs

Accra accrue
baa boo
baa'd booed
baaing booing
baas boos
balm boom
barb boob
barbed boobed
barbs boobs
barn boon
barns boons
baths booths
blah blew
bra brew
bras brews
brass Bruce 
Cali coolie
Calne coon
card cooed
Carl cool
carp coop
carped cooped
carping cooping
carps coops
cars coos
cart coot
carts coots
Chard chewed
chars chews
coons khans
grave groove
graves grooves
ha Hoo 
half hoof
halves hooves
hard who'd
harm whom
harp hoop
harped hooped
harping hooping
harps hoops
hearted hooted
jars Jews 
la lieu
lakh Luke 
Larne loon
larns loons
last loosed
ma moo
marched mooched
Marches mooches
marching mooching
marred mood
Mars moos
mart moot
pa pooh
raft roofed
rah rue
R's ooze
scarp scoop
scarps scoops
shah shoe
shahs shoes
shard shooed
spark spook
sparks spooks
ta to
tars twos
tart toot
tarted tooted
tarting tooting
tarts toots
Tsars zoos
yah you
yard you'd