French · Pronunciation Guide
lom — one syllable. The "h" is silent, the article is fused on, and the double "mm" is a real consonant.
One syllable, article included — that is the point of the elision. The "(m.)" is a gender note telling you the hidden article is "le", which is worth knowing because "l'" hides the gender completely.
Listen: l'homme (m.)
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L'homme au chapeau est mon voisin.
The man in the hat is my neighbor.
Listen: L'homme au chapeau est mon voisin.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"L'homme au chapeau est mon voisin" uses "au" — the contraction of "à le" — to mean "in the" or "with the", which is the French way of identifying someone by an accessory. "Chapeau" ends in the pure "oh" of "eau": sha-POH. "Voisin" ends in the nasal /ɛ̃/.
Learners aspirate the "h", producing "luh-HOM" with a break. There is no break and no "h" — the whole thing is one syllable. They also nasalize the vowel by analogy with "nom" or "bon", but the doubled "mm" blocks that. And note the plural "les hommes" requires a liaison: /le.z‿ɔm/, which is the only audible sign it is plural.