certification和certificate都是名词，并且中文意思都是证明，不同的是两个词强调的主体是不一样的。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。
单词中文意思不明确的时候，建议看看英文解释。
1、 [u]（出具）证明，强调的是动作（act/process），由权威机构提供的证明
#牛津词典# the act of certifying sth.
#朗文词典# an offical document that says that someone is allowed to do a certain job， that something is of good quality etc
the medical certification of the cause of death
为死因出具医学鉴定
2、 [u] （出具、颁发）证书，强调的是出具/颁发的动作（process）
#牛津词典# the process of giving certificates for a course of education
#朗文词典# the process of giving someone or something an offical document that says they are allowed to do a certain job， that something is of good qulity etc
certification of competence
颁发技能证书
1、[n] 证书，强调是一份证明（document/paper）
#柯林斯词典# A certificate is an offical document stating that particular facts are true.
#朗文词典# an offical document that states a fact or facts are true.
a birth certificate
出生证明
2、 [n] 文凭，合格证书，强调的还是一份证明（document/paper）
#柯林斯词典# A certificate is an offical document that you receive when you have completed a course of study or training. The qualification that you receive is sometimes also called a certificate.
#朗文词典# an offical paper stating that you have completed a course of study or passed an examination
a degree certificate
学位证书
