"Tablets" are portable, monolithic slabs that usually have LCD (or OLED) touch-screens and usually behave like multipurpose computing devices (like iPads, Android tablets, Microsoft Surface PC tablets). Tablets are larger than smartphones but some of the larger phones can blur that distinction and are known as "phablets". I don't think I've ever seen an LCD tablet that didn't have a touch-screen (because without touch-screen capability, it would be difficult to provide input to the tablet).
Non-tablet touch-screen devices are common. For example, many bank ATMs or grocery-store-check-outs have touch-screens, but they are don't have the portable "tablet" form-factor.
LCDs are a display technology but LCDs can be overlaid with invisible sensors that sense touch.