Samech

ס
Samech is rare. The letter occurs only nine times in Ruth. Three of those are in the word חֶסֶד - kindness among other things, and one in a related root, חָסָה take refuge, or shelter, or trust.. E.g. Ruth 1:8

יעשה יְהוָה עִמָּכֶם חֶסֶד

may יְהוָה deal with you kindly

In Ruth 1:17, we have the word יָסַף for adding

כֹּה יַעֲשֶׂה יְהוָה לִי וְכֹה יוֹסִיף

this יְהוָה deal with me and more

Ruth 2:7 - gather אָסַף, seems very close to adding

וְאָסַפְתִּי בָעֳמָרִים אַחֲרֵי הַקּוֹצְרִים

and gather among the sheaves after the reapers

Ruth 2:12 (mysteriously connected to 3:9 by the word כנף). I doubt this is a structural accident.

אֲשֶׁר-בָּאת לַחֲסוֹת תַּחַת-כְּנָפָיו

to whom you came to take refuge under his wings

Ruth 2:20 - kindness again

אֲשֶׁר לֹא-עָזַב חַסְדּוֹ

who has not left off his kindness

Ruth 3:3 - anoint, a relatively rare word and not the usual one for anointing or anointed which are related to מָשַׁח. Some people distrust etymology but I find it fascinating. How does language work and how did it begin? This word סוך has three homonyms that I see when scanning BDB meaning come to an end, cease, and hedge or fence, and reeds. These last two meanings seem related to סָכַךְ from which we get the feast of tabernacles חַג הַסֻּכֹּות (Leviticus 23:34).

וְרָחַצְתְּ וָסַכְתְּ

so wash yourself and anoint yourself

Ruth 3:10 - kindness again

הֵיטַבְתְּ חַסְדֵּךְ

you have made good your kindness

Ruth 4:1 - two instances of 'turn aside', a word that is also spelled with a שׂ and can mean apostatize.

וַיֹּאמֶר סוּרָה שְׁבָה-פֹּה

 פְּלֹנִי אַלְמֹנִי

וַיָּסַר וַיֵּשֵׁב

and he said turn aside sit here -

what a coincidence!

and he turned aside and sat down