charge vs assignment

charge and assignment both are nouns.

Word	Noun	Adjective	Verb	Adverb
charge	Yes	No	Yes	No
assignment	Yes	No	No	No

As nouns, assignment is a hypernym of charge; that is, assignment is a word with a broader meaning than charge:

charge: a special assignment that is given to a person or group
assignment: a duty that you are assigned to perform (especially in the armed forces)

Other hypernyms of charge include duty assignment.

charge (noun)	assignment (noun)
attention and management implying responsibility for safety	a duty that you are assigned to perform (especially in the armed forces)
an impetuous rush toward someone or something	the act of putting a person into a non-elective position
a special assignment that is given to a person or group	the act of distributing something to designated places or persons
a quantity of explosive to be set off at one time	an undertaking that you have been assigned to do (as by an instructor)
heraldry consisting of a design or image depicted on a shield	the instrument by which a claim or right or interest or property is transferred from one person to another
(criminal law) a pleading describing some wrong or offense	(law) a transfer of property by deed of conveyance
a formal statement of a command or injunction to do something
request for payment of a debt
an assertion that someone is guilty of a fault or offence
the swift release of a store of affective force
(psychoanalysis) the libidinal energy invested in some idea or person or object
a person committed to your care
the quantity of unbalanced electricity in a body (either positive or negative) and construed as an excess or deficiency of electrons
financial liabilities (such as a tax)
the price charged for some article or service

charge (verb)	assignment (verb)
energize a battery by passing a current through it in the direction opposite to discharge
cause formation of a net electrical charge in or on
saturate
attribute responsibility to
set or ask for a certain price
file a formal charge against
impose a task upon, assign a responsibility to
blame for, make a claim of wrongdoing or misbehavior against
make an accusatory claim
instruct or command with authority
instruct (a jury) about the law, its application, and the weighing of evidence
to make a rush at or sudden attack upon, as in battle
direct into a position for use
fill or load to capacity
provide (a device) with something necessary
place a heraldic bearing on
cause to be agitated, excited, or roused
move quickly and violently
lie down on command, of hunting dogs
pay with a credit card; pay with plastic money; postpone payment by recording a purchase as a debt
enter a certain amount as a charge
demand payment
give over to another for care or safekeeping
cause to be admitted; of persons to an institution
assign a duty, responsibility or obligation to