Unscramble Irpherids

What is the meaning of word irpherids unscrambled?

What 9 letter words can be made from letters I R P H E R I D S:

1. ridership - Definition of ridership

Make more words by adding or removing letters

How many 8 letter words can you make from letters I R P H E R I D S?
Which 8 letter words can be made by removing one letter and unscrambling the remaining letters?
1) Removing the letter I and unscrambling rpherids
2) Removing the letter R and unscrambling ipherids
3) Removing the letter P and unscrambling irherids
4) Removing the letter H and unscrambling irperids
5) Removing the letter E and unscrambling irphrids
6) Removing the letter R and unscrambling irpheids
7) Removing the letter I and unscrambling irpherds
8) Removing the letter D and unscrambling irpheris
9) Removing the letter S and unscrambling irpherid

More anagrams containing the letters I R P H E R I D S
irpherisd irphersdi pdireirhs hiidrerps