How to spell burglar
burglar
Not burgler.
The trap
The word burglar ends -ar, and burgler gives it the -er that most words for a person who does something take. Burglary keeps the A as well, so the two spellings agree.
An unstressed vowel flattens to the same sound whatever letter spells it, so the ear cannot tell them apart. A relative that stresses the syllable gives the letter back.
What it means
noun. A person who commits burglary.
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Play today's Daily FiveSpellingIQ is a skill rating for spelling ability, not a clinical or psychometric IQ measure. American English is canonical; common variants are accepted.