Underneath adv. : Beneath; below; in a lower place; under; as, a channel underneath the soil.

Underneath prep. : Under; beneath; below.

Example:
Can an extractor fan be installed Underneath a shelf?

Taxonomy
Cologne, Socks, babydolls, Men's Underwear Styles, bustiers corsets, Shapewear, Pajamas, Camisoles, Lingerie Styles, Tees, tights, Shop by Brand, brand name, teddy, Plus Size, Skincare, Briefs, slipper socks.

Defination from the web:
Retailer featuring brand name underwear for men and women. Find a selection of bras, panties, camisoles, hosiery, pajamas, sleepwear, shapewear, socks, underwear, and robes.