let vs allow

let is a noun but allow is not a noun.

Word	Noun	Adjective	Verb	Adverb
let	Yes	No	Yes	No
allow	No	No	Yes	No

As verbs, let and allow are synonyms defined as:

Other synonyms of let include countenance, permit.

As verbs, allow is a hyponym of let; that is, allow is a word with a more specific, narrower meaning than let:

let: consent to, give permission; permit
allow: allow the presence of or allow (an activity) without opposing or prohibiting

As verbs, let and allow are synonyms defined as:

let and allow: make it possible through a specific action or lack of action for something to happen

Other synonyms of let include permit.

let (noun)	allow (noun)
a serve that strikes the net before falling into the receiver's court; the ball must be served again

let (verb)	allow (verb)
leave unchanged	allow or plan for a certain possibility; concede the truth or validity of something
cause to move; cause to be in a certain position or condition	give or assign a resource to a particular person or cause
actively cause something to happen	consent to, give permission; permit
consent to, give permission; permit	allow the presence of or allow (an activity) without opposing or prohibiting
grant use or occupation of under a term of contract	let have
make it possible through a specific action or lack of action for something to happen	grant as a discount or in exchange
	make it possible through a specific action or lack of action for something to happen
	allow the other (baseball) team to score
	make a possibility or provide opportunity for; permit to be attainable or cause to remain
	afford possibility