cat*
Here are some words that match your criteria:

- cat
- cat and mouse
- cat and rat
- cat bear
- cat box
- cat burglar
- cat chow
- cat cracker
- cat fancier
- cat flea
- cat food
- cat rig
- CAT scan
- CAT scanner
- cat scratch disease
- cat shark
- cat sleep
- cat squirrel
- cat suit
- cat thyme
- cat valium
- cat's cradle
- cat's eye
- cat's feet
- cat's foot
- cat's-claw
- cat's-ear
- cat's-paw
- cat's-tail
- cat-o'-nine-tails
- cata-cornered
- catabatic
- catabatic wind
- catabiosis
- catabolic
- catabolise
- catabolism
- catabolize
- Catacala
- catachresis
- catachrestic
- catachrestical
- cataclinal
- cataclysm
- cataclysmal
- cataclysmic
- catacomb
- catacorner
- catadromous
- catafalque
- Cataflam
- Catalan
- catalase
- catalatic
- catalectic
- catalepsy
- cataleptic
- catalexis
- Catalina cherry
- Catalina Island
- catalog
- catalog buying
- cataloged procedure
- cataloger
- catalogue
- catalogued
- cataloguer
- Catalonia
- catalpa
- Catalpa bignioides
- Catalpa speciosa
- catalufa
- catalyse
- catalysis
- catalyst
- catalytic
- catalytic converter
- catalytic cracker
- catalytically
- catalyze
- catamaran
- catamenia
- catamenial
- catamount
- catamountain
- catananche
- Catananche caerula
- cataphasia
- cataphatic
- cataphatism
- cataphoresis
- cataphoretic
- cataphract
- cataphyll
- cataplasia
- cataplasm
- cataplastic
- Catapres
- catapult
- catapultian