especially adv. 特殊地;尤其是
(1)侧重于多种事物或人中比较突出的。I like all the subjects at school, especially English. (尤其是英语)
(2) especially 后可接介词短语或从句。I like the Yuelu Mountains, especially in spring. (尤其是在春天) Noise is unpleasant, especially when you are trying to sleep.
specially 侧重特意地、专门地做某事 (后面常接for sb. 或to do sth.)
I made a chocolate cake specially for you.