But most of all vs Especially vs Mainly vs Primarily

When to use each in English, with meaning, register, and examples.

But most of all

Top 2,000 (common)

Especially

Top 1,000 (very common)A2adverb

Mainly

Top 2,000 (common)B1adverb

Primarily

Top 2,000 (common)B2adverb
Most common: Especially
 But most of allEspeciallyMainlyPrimarily
Pronunciation🇬🇧 //bʌt məʊst əv ɔːl//🇺🇸 //bʌt moʊst əv ɔl//🇬🇧 /["/ɪˈspeʃəli/"]/🇺🇸 /["/ɪˈspeʃəli/"]/🇬🇧 /["/ˈmeɪnli/"]/🇺🇸 /["/ˈmeɪnli/"]/🇬🇧 /["/praɪˈmerəli//ˈpraɪmərəli/"]/🇺🇸 /["/praɪˈmerəli/"]/
MeaningUsed to emphasize something very important.More than usual; particularly.mostly or for the most partmainly; for the most part
ExampleI love traveling, but most of all, I enjoy meeting new people.I enjoy all kinds of music, especially jazz.She mainly works from home to achieve a better work-life balance.a course designed primarily for specialists
RegisterNeutralNeutralNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)Top 2,000 (common)Top 2,000 (common)
CEFR level-A2B1B2
Part of speechadverbadverbadverb
Collocationsbut most of all, I think, but most of all, it's clear, but most of all, we shouldespecially important, especially interesting, especially for you, especially relevant, especially helpfulmainly for, mainly because, mainly concerned, mainly composed, mainly focusedprimarily concerned, primarily focused, primarily used, primarily for, primarily about
Antonyms-especially not, not particularlyrarely, seldom, occasionallysecondarily, incidentally, subordinately
Common mistakesUsing it as a complete sentence without context., Confusing with 'but above all', which has a similar but slightly different emphasis.Often misused as 'especial' which is incorrect., Confused with 'specially', which has different meanings., Used in negative contexts where it can sound awkward.Using 'mainly' instead of 'main' as an adjective, Confusing 'mainly' with 'mainly' as a conjunction, Placing 'mainly' at the beginning of the sentence incorrectlyConfused with 'principally' which has a similar meaning but different usage., Using it in a negative context incorrectly, such as saying 'not primarily' when 'not mainly' is clearer., Incorrectly placing 'primarily' at the end of a sentence.
Usage notesTypically used in conversations or informal writing to highlight a key point. Avoid in very formal contexts.Used to highlight a specific example or situation. Common in both spoken and written English but may sound overly formal in casual conversations.Use 'mainly' in sentences to indicate the primary focus or majority aspect. It fits well in formal and informal contexts but avoid it in casual speech where shorter alternatives may suffice.Use 'primarily' when you want to focus on the main reason or purpose; it's suitable in both spoken and written English but is more common in formal contexts than casual conversation.

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But most of all
Especially
Mainly

Frequently asked questions: But most of all vs Especially vs Mainly vs Primarily

What's the difference between But most of all, Especially, Mainly, and Primarily?

But most of all: Used to emphasize something very important. Especially: More than usual; particularly. Mainly: mostly or for the most part Primarily: mainly; for the most part

Which is more common: But most of all, Especially, Mainly, and Primarily?

Especially is the most common in everyday English.

Which is more advanced: But most of all, Especially, Mainly, and Primarily?

Primarily is the highest level, at B2, on the CEFR scale.

Can you show an example of each?

But most of all: I love traveling, but most of all, I enjoy meeting new people. Especially: I enjoy all kinds of music, especially jazz. Mainly: She mainly works from home to achieve a better work-life balance. Primarily: a course designed primarily for specialists

Can I use But most of all, Especially, Mainly, and Primarily interchangeably?

Not always. But most of all, Especially, Mainly, and Primarily are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.