tèbié

特别

fēicháng

非常

相同

similarity

They are both degree adverbs which can be used to express a high degree

不同

Difference

特别 can also mean especially or specially

Eg. 他很喜欢做运动，特别是踢足球。

(He likes sports very much, especially football.)

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特别 can also be used as an adjective which

means special

Eg. 这个礼物很特别，我非常喜欢。

(This gift is very special and I like it very much.)

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