китф

китф: shoulder

Мӯи сараш то сари китф дароз буд.
Her hair was to the top of her shoulders in length.
Пеш аз сароидан китфҳоро боло набардошта, оромона нафас гиред.
Before singing breath softly without raising your shoulders.

Bonus:
Often this word is pronounced and even written as кифт. The two consonants are switched because it is easier to pronounce that way. Another example of this is қуфл (lock) which is more commonly prounounced as қулф.
To review body parts you can use Memrise, an online site for learning lists of words. Memrise: Tajik Human Body

устухон

устухон: bone

Дар бадани одам зиёда аз 220 устухон мавҷуд аст.
In the human body there are more than 220 bones.
Ҳеҷ як устухони Ӯ шикаста намешавад
Not one of his bones will be broken.

Bonus:
устухоншинос: osteologist
Names of some bones –
сутунмӯҳра: spine
қабурға: rib

чашм

чашм: eye

Мо ӯро бо чашмони худ дидаем.
We have seen him with our own eyes.
Шахси чашмонаш кабуд зудранҷ, вале зираку мушфиқ мешавад.
A person with blue eyes is easily offended, but wise and compassionate.

Bonus:
If you want to know what your eye colour says about your personality read this article from Tajikistan times.
When making a noun plural, generally the suffix ҳо is used for inanimate objects, and the suffix он is used for animals and people. There are a few exceptions. Some body parts can take the suffix он, for example чашмон (eyes) and китфон (shoulders). A few other inanimate objects can take the suffix он, for example ситорагон (stars) and дарахтон (trees).
Note that colloquially, ҳо is used for animals and people, as well as for inanimate objects.