Think this is worth following through:
Stringier, stingier, stinger, singer, singe, sine / sing, sin, in and I.
You can also complete this with the following words, which are the subject of debate as they are merely plurals: cleansers; splatters; drownings; wrappings; starvings; and trappings. On a similar basis the ten-letter word splittings causes debate, although, as Sarumite shows, splitting is OK.
Debate is also rife over the use of past tense forms, where the suffix -ed is added to the infinitive, e.g. replanted and restarted.
Finally, scrapping and strapping both work if you use pi as the penultimate word - but the argument goes that this is not an English word, but a Greek letter used to signify a mathematical term...
Ho hum - time to lie down, methinks....