certification强调的是出具证明的动作，为不可数名词；而certificate强调的是一份证明，为可数名词。两个词强调的主体是不一样的。certification和certificate都是名词，并且中文意思都是证明。

certification例句

The certification includes a first stage and second stage audit audit.

认证审核包括第一阶段审核和第二阶段现场审核。

Organic food must pass the certification by specific certification body.

有机食品必须通过专业认证机构的认证。

Products are certified by international quality and environmental certification.

产品均通过国际质量认证和环保认证。

certificate例句

The new degree and the existing certificate courses would run in parallel.

新的学位课程和现有的证书课程将并行开设。

A senior certificate with matric exemption is required for entry to university.

上大学需要有中学毕业的资格证书。

The bank manager is said to have issued fake certificates.

据说那个银行经理曾出具伪造的凭证。