商务出行

It depends on what’s your means ! If you wanna say that you have a business trip in English， the Chinese is “我要出差” So , the word is verb or noun not very important in our daily life~ That’s it , if you have any questions about Chinese , you could text me!

U can consider that it's a noun.

You can consider it a verb, a noun, or a Verb + Object combination Verb: 你明天出差吗？ Noun: 我觉得出差确实挺辛苦的 Combination (or separation :D): 我周二要出个差

Both works