Even though the question seems trivial, it's still a hotly debated topic (as far as I'm aware). For example, in the Oxford Handbook for Polysynthesis, Fernando Zúñiga says:

Recent literature (e.g. Dixon and Aikhenvald 2002b) has emphasized the need to distinguish, in principle, between low-level units identified via phonological and prosodic rules (p-words) and those identified via rules of grammar (g-words).

Is this a meaningful distinction? What other distinctions are there? What languages present problems when the concept of word is introduced to them?

closed as too broad by Skooba, curiousdannii, Rand al'Thor, bytebuster, CHEESE Feb 7 '18 at 22:22

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    As linguists like to joke, the best definition of a word is "the thing you put spaces around." – curiousdannii Feb 7 '18 at 0:56