I would like to use the word "know-how" in my letter of application. (I don't want to use "experience" as a replacement because I have used it before, therefore it wouldn't sound nice.)
Can I use it in this case or is it informal?
Use expertise, ability, skill, knowledge, facility, talent, command... if you don't want the (definitely) informal connotations of the somewhat childish...
know-how noun (informal)
1: ingenuity, aptitude, or skill; knack
2: commercial and saleable knowledge of how to do a particular thing; experience
informal
could be classified as "general reference", but I still think it's a fair question. I'll bet we could find a handful of words with theinformal
label in the dictionary that might seem formal enough to use in an application of some kind. In other words, "Is it informal?" is pretty straightforward and perhaps off-topic, but "Is it so informal enough that I should shy away from using it?" is a fair question that a learner should be able to inquire about here. As we both know, those labels don't always tell the full story.