Keys vs Password vs Solution

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

Keys

Top 1,000 (very common)

Password

Top 1,000 (very common)B2noun

Solution

Top 1,000 (very common)A2noun
 KeysPasswordSolution
Pronunciation🇬🇧 //kiːz//🇺🇸 //kiːz//🇬🇧 /["/ˈpɑːswɜːd/"]/🇺🇸 /["/ˈpæswɜːrd/"]/🇬🇧 /["/səˈluːʃn/"]/🇺🇸 /["/səˈluːʃn/"]/
MeaningMetal objects used to open locks.A secret word or phrase used to access something.An answer or way to solve a problem.
ExampleI lost my keys and couldn't get into my house.Enter a username and password to get into the system.The solution to the math problem was easier than I expected.
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)Top 1,000 (very common)
CEFR level-B2A2
Part of speechnounnoun
Collocationsset of keys, car keys, house keys, keys to success, keys on a keychaincorrect, valid, user, know, remember, choose, correct, valid, user, know, remember, choosecomplete, comprehensive, partial, look for, seek, work towards/​toward, solution for, solution to, part of the solution, concentrated, strong, dilute, contain, in solution
Antonyms-open, accessproblem, issue, complication
Common mistakesConfusing 'key' (singular) with 'keys' (plural)., Using 'key' to refer to something that is not a physical object., Mixing up 'key' with 'clue' in problem-solving contexts.Confusing with 'username' or 'login', Not capitalizing special characters as needed, Using easily guessable passwords like '123456'Confused with 'resolution' which can mean a firm decision., Using 'solution' as a verb instead of a noun., Mistaking 'solution' for something that is only mathematical.
Usage notesUse 'keys' to refer to objects for unlocking. Avoid using it in abstract contexts unrelated to physical locks.Used in contexts requiring security, like online accounts. Avoid using informal settings or casual conversation.Use 'solution' in both formal and informal contexts when discussing problems and their answers. Avoid using it in slang or overly casual conversations.

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Solution

Frequently asked questions: Keys vs Password vs Solution

What's the difference between Keys, Password, and Solution?

Keys: Metal objects used to open locks. Password: A secret word or phrase used to access something. Solution: An answer or way to solve a problem.

Which is more advanced: Keys, Password, and Solution?

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

Can you show an example of each?

Keys: I lost my keys and couldn't get into my house. Password: Enter a username and password to get into the system. Solution: The solution to the math problem was easier than I expected.

Can I use Keys, Password, and Solution interchangeably?

Not always. Keys, Password, and Solution 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.