These keys are the only ones that can be used as letters upside down on a calculator.

1 – I
2 – 2 (or to)
3 – E
4 – H
5 – S
6 – G
7 – L
8 – B
0 – O or D (if you need the 0 to be on the end of the word, put a decimal and then type the rest of the number)

These are all the words that can be made. If you have another word, leave a comment:

Hi – 14

Blob – 8078

Hell – 7734

Blog – 6078

Glob – 8076

Hello – 0.7734

Shell – 77345

Ho – 0.4

His Glob – 8076.514

His – 514

His Blob – 8078.514

His Hell – 7734.514

Shells – 577435

Ill – 771

Shibobo – 0.808145

Bobo – 0.808

Lose – 3507

Loses – 53507

Hells – 57734

Blobs – 58078

Blogs – 56078

hoho – 0.404

hohos – 50404

hos – 504

bobos – 50808

boob – 8008

hoohooo – 0.004004

boobies – 5318008

boobless – 55378008

go2hell – 7734206

Less – 5537

hill – 7714