Strictly speaking, it is incorrect to use insure and ensure interchangeably. Ensure means to make sure or to guarantee and insure refers to the financial service of insurance.

Comparison chart

Ensure versus Insure comparison chart
Edit this comparison chartEnsureInsure
Meaning to make sure, to guarantee to safeguard against loss or damage (by buying insurance).

Examples

The word insure is used mostly in a financial context as it relates to insurance. For example,

The word ensure usually means "to make sure" or "to guarantee". For example,

Video explaining the ensure - insure difference

Usage in the U.S.

In colloquial usage — especially in the United States — the words insure and ensure are indeed used interchangeably. So some dictionaries list a secondary meaning of the word insure as a synonym for ensure.

References

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"Ensure vs Insure." Diffen.com. Diffen LLC, n.d. Web. 14 Jul 2016. < >