"Llanfairpwllgwyngyllgogerychwyrn-drobwllllantysiliogogogoch" (58 characters, representing 51 letters) is the longest place name in Wales. The actual name commonly used for the town is much shorter. (Llanfairpwllgwyngyllgogerychwyrn-drobwllllantysiliogogogoch does not really have a hyphen at that point, but the markup language of this page limits the length of words!)
The second longest word in the Welsh language is "Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch," which is a village name in Wales.
'You' is not a Welsh word.
The word 'fern' is not a Welsh word and has no meaning. The Welsh word for 'a fern' is 'rhedynen'.
It's not a word in Welsh.
It's not a Welsh word.
'Carley' is not a Welsh word.
Perisgop is the Welsh word for a periscope.
It doesn't appear to be a Welsh word.
"Heol" is the Welsh word for "road" or "street."
This is not a Welsh word, but you might mean 'barod,' which means 'ready.'
'Sorry' isn't a Welsh word so it has no meaning in Welsh.
Do you mean daear? If so that word means the Earth, soil or ground.