According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 15 words with the pattern
-----PAC-. That is, nine letter words with 6th letter P and 7th
letter A and 8th letter C. In alphabetical order, they are:
aerospace
backspace
headspace
hemispace
incompact
loadspace
meatspace
multipack
nonimpact
pickapack
portapack
recompact
retropack
stroupach
workspace