Chateau.
They type of French castle that begins with the letters ch and has seven letters is a chateau. A chateau can be with or without fortifications and is usually where someone of nobility resides.
Some French words that have "ch" in them include: Chocolat (chocolate) Chat (cat) Château (castle) Chanson (song)
A food in sandwiches that begins with ch is cheese.
Chimes ...
English 'begins' is 'commence' in French.
neptune
cheese check checkmate chess chin
China rose Chrysanthemum
Chinchilla, chimp or chimpanzee
Chinstrap Penguin is an ocean animal. It begins with the letters ch.
turd
The French city that begins with an M is Marseille.