Just shy of 15 months, here are the words I have noted which Oliver knows. There may be a few others that I can't recall at the moment:

Receptive:
yum-yum
mommy
daddy
Nick
Alex
Elliot
Precious (doggie)
more
uh oh
bite
kiss
peek a boo
up
knock knock
drink
car
truck
airplane
outside
bath
wash, wash
wipe, wipe
all clean
all done/ finished (hold palms up to indicate gesture!)
pacie (pacifier)
open
Where is it?
no
Oliver/ Ollie
ice cream
hot

Word he can say:

mah (more)
eh eh (uh oh)
ah uh (all done)
mom (mommy)
ha (hot)
eye- eee (ice cream)
um-um (yum yum)