account vs reason

account and reason both are nouns.

Word	Noun	Adjective	Verb	Adverb
account	Yes	No	Yes	No
reason	Yes	No	Yes	No

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

account: a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.
reason: an explanation of the cause of some phenomenon

As nouns, reason is a hypernym of account; that is, reason is a word with a broader meaning than account:

Other hypernyms of account include ground, occasion.

account (noun)	reason (noun)
the quality of taking advantage	the capacity for rational thought or inference or discrimination
importance or value	a fact that logically justifies some premise or conclusion
a record or narrative description of past events	a justification for something existing or happening
an itemized statement of money owed for goods shipped or services rendered	an explanation of the cause of some phenomenon
a short account of the news	a rational motive for a belief or action
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.	the state of having good sense and sound judgment
the act of informing by verbal report
grounds
a statement of recent transactions and the resulting balance
a formal contractual relationship established to provide for regular banking or brokerage or business services

account (verb)	reason (verb)
furnish a justifying analysis or explanation	think logically
to give an account or representation of in words	decide by reasoning; draw or come to a conclusion
keep an account of	present reasons and arguments
be the sole or primary factor in the existence, acquisition, supply, or disposal of something