'Maybe' is a single word. It's an adverb which means 'perhaps' or 'possibly'. 'Maybe' usually comes at the beginning of a sentence (Before the subject and verb).
* The common structure of using 'maybe' as an adverb is: [Maybe + Subject + Verb + The rest of the sentence]
On the other hand, 'May be' is a verb phrase consisting of two different words 'May' and 'Be' where 'May' is a modal verb used to express a possibility and 'Be' is the main verb. Thus, 'May be' indicates or expresses possibility.
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