I know why you’re confused.
The plural of the noun analysis /əˈnæləsɪs/ is analyses /əˈnæləsiːz/. Since the noun has a plural form, it is a count noun not an uncountable one.
The singular of the verb analyse /ˈænəˌlaɪz/ is also spelled analyses — but now that spelling is suddenly pronounced /ˈænəˌlaɪzəz/, which is quite different from the plural noun’s pronunciation.
You may spell the verbs analyze and analyzes if you wish; it changes nothing in the pronunciation. Just make sure to be consistent and stick to one or the other.
It’s quite normal in English to have a noun and verb spelled the same way but pronounced differently.
The OED attests that historically the noun analyse did once upon a time exist in English, but says that that usage is now considered obsolete today. In our day, analyse “can” only be a verb in new writing, never a noun. Sometimes the OED is a bit overzealous with obsolescing words that you can still find in rare usage, but I’d advise against using this one if I were you.