As nouns the difference between rector and cat
is that
rector is in the anglican church, a cleric in charge of a parish and who owns the tithes of it while
cat is an animal of the family
felidae : or
cat can be a catamaran or
cat can be (computing) a program and command in unix that reads one or more files and directs their content to an output device or
cat can be or
cat can be (military|naval) a catapult.
As a verb cat is
(nautical) to hoist (the anchor) by its ring so that it hangs at the cathead or
cat can be (computing) to apply the
cat command to (one or more files).
As an adjective cat is
(ireland|informal) terrible, disastrous.