hold vs extension

hold and extension both are nouns.

Word	Noun	Adjective	Verb	Adverb
hold	Yes	No	Yes	No
extension	Yes	No	No	No

As nouns, extension is a hyponym of hold; that is, extension is a word with a more specific, narrower meaning than hold:

hold: time during which some action is awaited
extension: a mutually agreed delay in the date set for the completion of a job or payment of a debt

Other hyponyms of hold include moratorium, retardation.

hold (noun)	extension (noun)
the act of grasping	an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
the appendage to an object that is designed to be held in order to use or move it	act of stretching or straightening out a flexed limb
a cell in a jail or prison	act of expanding in scope; making more widely available
the space in a ship or aircraft for storing cargo	an addition that extends a main building
a stronghold	an addition to the length of something
power by which something or someone is affected or dominated	an additional telephone set that is connected to the same telephone line
understanding of the nature or meaning or quality or magnitude of something	amount or degree or range to which something extends
a state of being confined (usually for a short time)	the ability to raise the working leg high in the air
time during which some action is awaited	the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
	a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
	the spreading of something (a belief or practice) into new regions
	a mutually agreed delay in the date set for the completion of a job or payment of a debt

hold (verb)	extension (verb)
keep from exhaling or expelling
keep in mind or convey as a conviction or view
hold the attention of
assert or affirm
remain committed to
declare to be
bind by an obligation; cause to be indebted
be in accord; be in agreement
aim, point, or direct
protect against a challenge or attack
drink alcohol without showing ill effects
have or hold in one's hands or grip
be the physical support of; carry the weight of
support or hold in a certain manner
to close within bounds, or otherwise limit or deprive of free movement
cover as for protection against noise or smell
organize or be responsible for
maintain (a theory, thoughts, or feelings)
cause to come to an abrupt stop
have or possess, either in a concrete or an abstract sense
secure and keep for possible future use or application
have rightfully; of rights, titles, and offices
arrange for and reserve (something for someone else) in advance
keep from departing
take and maintain control over, often by violent means
lessen the intensity of; temper; hold in restraint; hold or keep within limits
cause to continue in a certain state, position, or activity
remain in a certain state, position, or condition
be valid, applicable, or true
be pertinent or relevant or applicable
have room for; hold without crowding
have as a major characteristic
resist or confront with resistance
stop dealing with
contain or hold; have within
be capable of holding or containing