As nouns the difference between fistula and abscess

is that fistula is (medicine) an abnormal connection or passageway between organs or vessels that normally do not connect while abscess is a cavity caused by tissue destruction, usually because of infection, filled with pus and surrounded by inflamed tissue .

As a verb abscess is

to form a pus filled cavity typically from an infection.

As adverbs the difference between moderately and slightly

is that moderately is in a moderate manner while slightly is slenderly; delicately.

As a verb demolish is

to destroy; to destruct.

As a verb demolish

is to destroy; to destruct.

As a noun breakdown is

a failure, particularly mechanical; something that has failed.

As verbs the difference between demolish and impair

is that demolish is to destroy; to destruct while impair is to weaken; to affect negatively; to have a diminishing effect on.

As an adjective impair is

(obsolete) not fit or appropriate.

As nouns the difference between breakdown and breakoff

is that breakdown is a failure, particularly mechanical; something that has failed while breakoff is discontinuance (act of breaking off).

In countable terms the difference between annoyance and disappointment

is that annoyance is an act or instance of annoying while disappointment is a circumstance in which a strongly held expectation is not met.

In uncountable terms the difference between annoyance and disappointment

is that annoyance is the psychological state of being annoyed or irritated while disappointment is the emotion felt when a strongly held expectation is not met.

Hear is a synonym of catch.

In transitive terms the difference between catch and hear

is that catch is to attract and hold (a faculty or organ of sense) while hear is to listen to (a person, case) in a court of law; to try.

In intransitive terms the difference between catch and hear

is that catch is to get pregnant while hear is to perceive sounds through the ear.

As verbs the difference between catch and hear

is that catch is To capture, overtake.hear is to perceive sounds through the ear.

As a noun catch

is the act of seizing or capturing. {{jump|act of capturing}} singular.

In obsolete|lang=en terms the difference between natural and common

is that natural is (obsolete) born out of wedlock; illegitimate; bastard while common is (obsolete) to board together; to eat at a table in common.

As adjectives the difference between natural and common

is that natural is that exists and evolved within the confines of an ecosystem while common is mutual; shared by more than one.

As nouns the difference between natural and common

is that natural is while common is mutual good, shared by more than one.

As a verb common is

(obsolete) to communicate (something).

As nouns the difference between planet and asteroid

is that planet is while asteroid is asteroid.