The standard expression is written “no one,” and Cambridge also records the hyphenated variant “no-one.” The fully closed spelling “noone” is not the accepted form in the cited grammar guidance.
ReviewedEvidence1 sourceSectionEnglish Usage
Quick answer
Write “no one” (or accepted “no-one” where appropriate), not “noone”.
Key details
Confusion Familyword-boundary
Rule Familyword-boundary
Termsno one, no-one, noone
Further guidance
Core difference
Cambridge records “no one” as two words and also recognizes the hyphenated “no-one”; it explicitly says not to write the closed form “noone”.
Usage Boundary
Use “no one” or, where the governing variety/style permits it, “no-one”; do not close the expression as “noone”.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
“Anyone” is one word when it means any person. “Any one” is written as two words when the construction refers to a single member of a larger set, including the common pattern “any one of …”.
“Everyone” is one word when it means every person. “Every one” is two words when one is a separate element referring to each individual member of a set, especially in constructions such as “every one of them.”
“Someone” is the standard one-word pronoun for an unspecified person. The two-word sequence “some one” is possible when “one” remains a separate word and the construction singles out an individual member of a group, so the forms should not be treated as freely interchangeable.
Standard English writes “a lot” as two words for a large amount, number, frequency, or degree. “Alot” is a common misspelling in this sense; it should not be confused with the separate verb “allot.”
“Any more” can be a determiner for additional quantity and an adverb meaning “no longer.” Cambridge notes that the one-word adverb “anymore” is especially common in American English, while the determiner remains two words.
“Blackout” is the closed noun, while “black out” is the two-word phrasal verb. The verb can describe losing consciousness or obscuring/darkening something; the noun names the resulting event or state.
