secretly

As adverbs the difference between quietly and secretly

is that quietly is in a quiet manner while secretly is in secret, covertly.

As adverbs the difference between publicly and secretly

is that publicly is in public, openly, in an open and public manner while secretly is in secret, covertly.

As adverbs the difference between furtively and secretly

is that furtively is in a furtive manner while secretly is in secret, covertly.

As adverbs the difference between clandestinely and secretly

is that clandestinely is in a secret or covert manner while secretly is in secret, covertly.

As adverbs the difference between mysteriously and secretly

is that mysteriously is in a mysterious manner while secretly is in secret, covertly.

As adverbs the difference between secretly and secrely

is that secretly is in secret, covertly while secrely is obsolete form of secretly.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adverb secretly is

in secret, covertly.

As adverbs the difference between discreetly and secretly

is that discreetly is acting in a discreet manner; one that respects privacy or secrecy; quietly; diplomatically while secretly is in secret, covertly.

Occultly is a synonym of secretly.

As adverbs the difference between secretly and occultly

is that secretly is in secret, covertly while occultly is in an occult manner.