Rely vs Trust

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

Rely

Top 1,000 (very common) B2 verb

Trust

Top 1,000 (very common) B2 noun

	Rely	Trust
Pronunciation	🇬🇧 /["/rɪˈlaɪ/","/rɪˈlaɪz/","/rɪˈlaɪd/","/rɪˈlaɪɪŋ/"]/ 🇺🇸 /["/rɪˈlaɪ/","/rɪˈlaɪz/","/rɪˈlaɪd/","/rɪˈlaɪɪŋ/"]/	🇬🇧 /["/trʌst/"]/ 🇺🇸 /["/trʌst/"]/
Meaning	To depend on someone or something for help or support.	To believe in someone or something.
Example	I can always rely on my best friend.	Her trust in him was unwavering, even when others doubted him.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 1,000 (very common)
CEFR level	B2	B2
Part of speech	verb	noun
Collocations	rely on someone, rely heavily, rely mostly, rely primarily	great, absolute, complete, have, place, put, exist, trust among, trust between, trust for, a breach of trust, a lack of trust, a position of trust, offshore, investment, unit, hold something in, hold something on, keep something in, account, assets, fund, in trust, trust for, independent, charitable, non-profit, manage, run, own, manage, run, trust for
Antonyms	distrust, neglect, abandon	distrust, mistrust
Common mistakes	Mistakenly use 'rely' without 'on', Confused with 'lie' in context, Using 'rely' with inanimate objects incorrectly	Confused with 'rely on'—they have slightly different meanings., Using 'trust' with inanimate objects is uncommon—better to say 'rely on'., Mixing up 'trust' with 'believe'—they are similar but not interchangeable.
Usage notes	Commonly used in both spoken and written English. Be careful not to confuse with 'trust'. Not suitable in very formal contexts.	Use 'trust' in neutral contexts like personal relationships or business. Avoid using it where skepticism is implied, such as in formal reports.

See it in real clips

Sherlock › S1 E1

Think! Who do we trust, even though we don't know them?

House Of Cards › S1 E1

Then yes, your trust.

Peaky Blinders › S1 E1

I don't trust any of youse

Sherlock › S1 E1

Think! Who do we trust, even though we don't know them?

House Of Cards › S1 E1

Then yes, your trust.

Trust

Frequently asked questions: Rely vs Trust

What's the difference between Rely and Trust?

Rely: To depend on someone or something for help or support. Trust: To believe in someone or something.

Are Rely and Trust the same CEFR level?

Rely: B2, Trust: B2 on the CEFR scale.

What part of speech are Rely and Trust?

Rely: verb, Trust: noun.

Can you show an example of each?

Rely: I can always rely on my best friend. Trust: Her trust in him was unwavering, even when others doubted him.

Can I use Rely and Trust interchangeably?

Not always. Rely and Trust 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.