countryside是名詞,只有鄉(xiāng)下,農(nóng)村的意思；
而country作為名詞通常是國家的意思,但在某些場景中也有農(nóng)村的意思,要根據(jù)上下文來判斷；country還可作為形容詞使用,指國家的,農(nóng)村的.
例句：I like my country.我愛我的國家
in the western countries在西方各國
Which do you prefer to live in a city or in the country 你歡喜住在城里還是住在鄉(xiāng)下?（這里根據(jù)場景判斷country指的是鄉(xiāng)下）
I like listening country music.我喜歡聽鄉(xiāng)村音樂（country作為形容詞使用）
I'm from countryside.我來自農(nóng)村
具體來說,countryside 常用來泛指一切鄉(xiāng)村地域或居民.例如：
the countryside is the most beautiful at this time.此時農(nóng)村景色最美.
i bought many pictures of the chinese countryside.我買了許多有關(guān)中國農(nóng)村的圖片.
country 作“鄉(xiāng)村”講時,側(cè)重指區(qū)別于城市的鄉(xiāng)間、鄉(xiāng)下.例如：
they are leaving the country and moving into the town.他們離開鄉(xiāng)下搬到城里去了.
i am going to spend this summer vacation with my grandmother in the country.我準(zhǔn)備今天和祖母在鄉(xiāng)下過暑假.
一般說來,表示“國家”的country可與不定冠詞連用；而表示“鄉(xiāng)村”之義的country則總是同定冠詞一同出現(xiàn).
最后看一下這兩個詞的英文解釋：
A "countryside" refers to rural areas that are open.Forest,wetlands,and other areas with a low population density are not a countryside.
The "country" areas are rural areas - farms and small villages.
hope it can help.