joelday@Could you please provide reproducible steps, actual, expected behavior screencast for better understanding the issue to triage it further.

Repro steps:
1. Type one of the above mentioned words into a text field in Chrome that will be spell checked.

Result: The word is marked as misspelled.
Expected: The word is not marked as misspelled.

Also:

uncapitalized

Please also add:

catalogued

@Srujana: srsly?

@joelday: I've put together a set of steps for contributing words to the Chromium dictionary:

https://bugs.chromium.org/p/chromium/issues/detail?id=446077#c12

Please note - Chrome's spellchecker needs word stems. I.e. instead of "catalogued", "catalogue". Instead of "scaffolded", "scaffold", etc. 

@groby: the spell checker already supports dictionary definitions using stemming via affixes (http://www.chromium.org/developers/how-tos/editing-the-spell-checking-dictionaries.

Other words to add: natively, scalable.

@dandv: I know :) That's why I said we need the word stems. If you can provide the affix rules together with that, even better.

accelerometer

dialer

idempotence

parallelepiped

strategize

anonymize, anonymizing

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impactful

decrement

This would be a good first issue for new committers.