חילם. מָמוֹנָם וְכֵן עָשָׂה לִי אֶת הַחַיִל הַזֶּה (דברים ח'), וְיִשְׂרָאֵל עֹשֶׂה חָיִל (במדבר כ"ד), וְעָזְבוּ לַאֲחֵרִים חֵילָם (תהילים מ"ט):
חילם means THEIR WEALTH. Examples are: (Deuteronomy 8:17) “hath gotten me this (חיל) wealth”; (Numbers 19:18) “and Israel acquireth (חיל) wealth”; (Psalms 49:11) “and they leave (חילם) their wealth to others”.
שבו. לְשׁוֹן שְׁבִיָּה, לְפִיכָךְ טַעֲמוֹ מִלְּרָע:
שבו has the meaning of taking captive (i.e. it is the Kal. perfect, 3rd pl. of the root שבה and means “they took captive”), and therefore it is accented on the last syllable (whereas שָׁבוּ, accented on the first syllable, is the same form of the verb שוב and means “they returned”).