Some legal words are marked as typo by spellcheck

I wrote "scalable" in hackmd note and found it was marked as typo by spellcheck.
I found some other words in [here](https://bugs.chromium.org/p/chromium/issues/detail?id=596139) also.
Is this a bug?

I list them following FYI:
- accelerometer
- architected
- artisanal
- catalogued
- centric
- csc (cosecant)
- descension
- dialer
- disassembler
- exfoliant
- fetishization
- harkening
- idempotence
- instantiation
- iteratively
- lossiness
- minification
- parallelepiped
- pluralistically
- polymorphism
- posterize
- rasterized
- renderer
- scaffolded
- scalable
- schemas
- serializability
- serializable
- trichotillomania
- uncapitalized
- virtualized