Head Office, Main Shop, Shop Name Suffix
noun, suffix
The main shop is the main shop or the head office.
ほんぽ
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ベビー用品は、いつも赤ちゃん本舗で買います。
I always buy baby things at the main baby shop.