二者含義不同。Application是名詞，意思是申請、請求、申請書、申請表、應用、運用、涂抹、敷用等。Applicant是名詞，意思是申請人。

applicant例句

The job applicant must have good verbal skills.

應聘這份工作的人必須具有良好的語言表達技能。

The applicant has experience in teaching and, more relevantly,in industry.

這名申請者有教學經驗，更重要的是，也有企業工作的經驗。

Not every applicant had a degree.

不是所有的求職者都有學位。

application例句

Someone has mixed up all the application forms.

有人把申請表都弄亂了。

Your application will be kept on file.

你的申請書將存檔。

My application got lost in the post.

我的申請書寄丟了。

Have you sent in your application yet?

你把申請書寄去了沒有？