captcha

As an initialism app

is actinobacllus pleuropneumoniae.

As a noun captcha is

(captcha).

As a verb fa

is to make.

As a noun captcha is

(captcha).

As nouns the difference between captcha and english

is that captcha is a CAPTCHA is a human response test that requires you to enter a series of letters and/or numbers and/or symbols correctly to prove you are a human and not a computer program attempting to spam the site while English is one's ability to employ the English language correctly.

As an adjective English is

of or pertaining to England or its people.

As a proper noun English is

the people of England; Englishmen and Englishwomen.

As a verb English is

to translate, adapt or render into English.