Drop letter, add letter ..

order - erred

Erred - rider

rider - diver

diver - dirge

Dirge -glide

glide - guild

Guild - Build

Build - blind

blind - lined

lined - diner

diner - inner

Inner - reign

reign - grain

Grain - range

range - eager

Eager - green

green - never

Never - raven

Raven - Grave

Grave - verge

verge ~ fever

Fever - fewer

fewer - wafer

wafer - water

Water - wrath

wrath - trawl

Trawl - ultra

Ultra - Alter

Alter - laser

laser - slate