A spaniard = Spanish?

Spaniard (noun) = someone from Spain.(Spaniard is singular)
   
the Spanish (noun) = people from Spain. (In this case, Spanish is plural)
 
Spanish (noun) = the language used in Spain and South America, except Brazil.(西班牙語)

Spanish (adjective) = relating to Spain, its people, or its language.
 
"Spanish" can be a noun as well as an adjective.
 
He is a Spaniard. 他是一個西班牙人

He is Spanish. 他是西班牙人; or 他是西班牙籍
 
Spaniard and Spanish (The alphabet "S" 要 capital letter).

由於知道問題進入投票階段時將會被某一個回應者以多個不同用戶灌票，雖然覺得可惜，但只有以不回答這問題以示抗議。

'A Spaniard' is noun, meaning someone of Spnish nationality, whereas
'Spanish' is just an adjective, that's all.