He could not win but learnt a lot. Which part of speech is but?

এই টপিকের আরও কিছু প্রশ্ন:

• We work every day except Friday. What part of speech is except?
• The mother sat vigilantly beside the sick baby. Here vigilantly is?
• Identify the word that can be used as both singular and plural.
• What is the verb form of false?
• The adverb of the noun rotation is?